MAGETWO-91530: Expose Authorize.net Response Codes in Checkout

- Propagate payment error message

Author: mcahriman

app/code/Magento/Payment/view/frontend/templates/transparent/iframe.phtml

@@ -40,9 +40,7 @@ $params = $block->getParams();
                     $(parent).trigger('clearTimeout');
                     fullScreenLoader.stopLoader();
                     globalMessageList.addErrorMessage({
-                        message: $t(
-                            'A server error stopped your order from being placed. Please try to place your order again.'
-                        )
+                        message: $t(<?=json_encode($params['error_msg'])?>)
                     });
                 }
             );